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Giant negative magnetoresistance of spin polarons in magnetic semiconductors–chromium-doped Ti2O3 thin films

journal contribution
posted on 18.02.2005, 00:00 by Zhenjun Wang, Yuanjia Hong, Jinke Tang, Cosmin Radu, Yuxi Chen, Leonard Spinu, Weilie Zhou, Le Duc Tung
Epitaxial Cr-doped Ti2O3 films show giant negative magnetoresistance up to −365% at 2 K. The resistivity of the doped samples follows the behavior expected of spin (magnetic) polarons at low temperature. Namely, ρ=ρ0 exp(T0 /T)p, where p=0.5 in zero field. A large applied field quenches the spin polarons and p is reduced to 0.25 expected for lattice polarons. The formation of spin polarons is an indication of strong exchange coupling between the magnetic ions and holes in the system.

History

ISO

eng

Language

English

Publisher

University of Wyoming. Libraries

Journal title

APPLIED PHYSICS LETTERS

Collection

Faculty Publications - Physics and Astronomy

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Faculty Publications - Physics and Astronomy

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Exports